Staff Data Scientist

Role Description

The Firefox Data Science team partners with Product and Engineering to grow usage of our flagship product: Firefox, the privacy-minded web browser. Our work informs prioritization, investment decisions, and the long-term growth strategy across Firefox.

This Staff Data Scientist will own the analytical strategy for a major product area:

• Identifying the right questions
• Defining how success is measured
• Driving decisions that shape Firefox’s growth trajectory

You will be a strategic partner to product and engineering leadership:

• Framing problems
• Designing measurement approaches
• Translating data into clear recommendations that influence roadmap and resource allocation

You will also raise the analytical bar across the team by:

• Establishing frameworks
• Mentoring other data scientists
• Setting standards for how we measure and learn

This role requires:

• The judgment to know which problems matter most
• The technical depth to solve them rigorously
• The influence to ensure the work drives action

Qualifications

• 8+ years of experience in data science, analytics, or applied quantitative analysis, with a track record of shaping product strategy through data
• Demonstrated ability to lead complex, cross-functional analytical initiatives from problem framing through stakeholder alignment to decision
• Deep expertise in experimentation (A/B testing) and causal inference, with strong judgment about when each method applies and what conclusions they support
• Advanced proficiency in SQL and Python for analysis, modeling, and validation
• Experience defining and owning product metrics that teams actually use to make decisions
• Strong opinions, loosely held: you can take a position on what the data says, advocate for it clearly, and update when the evidence changes
• Track record of mentoring or technically leading other data scientists

Requirements

• Commitment to our values:
• Welcoming differences
• Being relationship-minded
• Practicing responsible participation
• Having grit

Benefits

• Generous performance-based bonus plans to all eligible employees - we share in our success as one team
• Rich medical, dental, and vision coverage
• Generous retirement contributions with 100% immediate vesting (regardless of whether you contribute)
• Quarterly all-company wellness days where everyone takes a pause together
• Country specific holidays plus a day off for your birthday
• One-time home office stipend
• Annual professional development budget
• Quarterly well-being stipend
• Considerable paid parental leave
• Employee referral bonus program
• Other benefits (life/AD&D, disability, EAP, etc. varies by country)